Page 402 - Emergency Response Book

Example Calculation 1 12

The intensity of radiation is 530 R/h at 5 feet away from a

source. What is the intensity of the radiation at 10 feet?

• Rework the equation to solve for the intensity at distance 2

I = I x D 1 2 / D 2 2

1
2

• Plug in the known values

I = 530R/h x (5ft) / (10ft) 2
2

2

• Solve for I 2

I = 132.5 R/h

2

• In this instance the distance has been doubled and the

intensity at that point has decreased by a factor of four.

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